In order to keep spoilers from leaking out, we usually only give the actors the scenes they're in and general descriptions of the characters involved. Usually, the voice actor will be in the recording booth solo and someone from the dev audio team will run the other lines for the actor to play off of and respond to. In Japan, schedules permitting, they will sometimes bring in multiple actors to record those scenes together, resulting in more natural feeling conversations in game. That's more difficult to arrange in the US, so most voiced conversations are stitched together from separate performances.
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